In this paper, we characterize the maximal violation of Ardehali's inequality of n qubits by showing that GHZ's states and the states obtained from them by local unitary transformations are the unique states that maximally violate the Ardehali's inequalities. This concludes that Ardehali's inequalities can be used to characterize maximally entangled states of n qubits, as the same as Mermin's and Bell-Klyshko's inequalities.
@article{arxiv.quant-ph/0407110,
title = {Maximal violation of the Ardehali's inequality of $n$ qubits},
author = {Zeqian Chen},
journal= {arXiv preprint arXiv:quant-ph/0407110},
year = {2007}
}